path: root/kernel/livepatch/core.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LIVEPATCH_CORE_H
#define _LIVEPATCH_CORE_H

#include <linux/livepatch.h>

extern struct mutex klp_mutex;
extern struct list_head klp_patches;

#define klp_for_each_patch_safe(patch, tmp_patch)		\
	list_for_each_entry_safe(patch, tmp_patch, &klp_patches, list)

#define klp_for_each_patch(patch)	\
	list_for_each_entry(patch, &klp_patches, list)

void klp_free_patch_start(struct klp_patch *patch);
void klp_discard_replaced_patches(struct klp_patch *new_patch);
void klp_discard_nops(struct klp_patch *new_patch);

static inline bool klp_is_object_loaded(struct klp_object *obj)
{
	return !obj->name || obj->mod;
}

static inline int klp_pre_patch_callback(struct klp_object *obj)
{
	int ret = 0;

	if (obj->callbacks.pre_patch)
		ret = (*obj->callbacks.pre_patch)(obj);

	obj->callbacks.post_unpatch_enabled = !ret;

	return ret;
}

static inline void klp_post_patch_callback(struct klp_object *obj)
{
	if (obj->callbacks.post_patch)
		(*obj->callbacks.post_patch)(obj);
}

static inline void klp_pre_unpatch_callback(struct klp_object *obj)
{
	if (obj->callbacks.pre_unpatch)
		(*obj->callbacks.pre_unpatch)(obj);
}

static inline void klp_post_unpatch_callback(struct klp_object *obj)
{
	if (obj->callbacks.post_unpatch_enabled &&
	    obj->callbacks.post_unpatch)
		(*obj->callbacks.post_unpatch)(obj);

	obj->callbacks.post_unpatch_enabled = false;
}

#endif /* _LIVEPATCH_CORE_H */